import React, { useState, useEffect, useRef } from "react";
import Sidebar from "@/components/SettingsSidebar";
import { isMobile } from "react-device-detect";
import System from "@/models/system";
import showToast from "@/utils/toast";
import { useModal } from "@/hooks/useModal";
import CTAButton from "@/components/lib/CTAButton";
import { CaretUpDown, MagnifyingGlass, X } from "@phosphor-icons/react";
import { useTranslation } from "react-i18next";
import PreLoader from "@/components/Preloader";
import ChangeWarningModal from "@/components/ChangeWarning";
import ModalWrapper from "@/components/ModalWrapper";
import VectorDBItem from "@/components/VectorDBSelection/VectorDBItem";

import LanceDbLogo from "@/media/vectordbs/lancedb.png";
import ChromaLogo from "@/media/vectordbs/chroma.png";
import PineconeLogo from "@/media/vectordbs/pinecone.png";
import WeaviateLogo from "@/media/vectordbs/weaviate.png";
import QDrantLogo from "@/media/vectordbs/qdrant.png";
import MilvusLogo from "@/media/vectordbs/milvus.png";
import ZillizLogo from "@/media/vectordbs/zilliz.png";
import AstraDBLogo from "@/media/vectordbs/astraDB.png";
import PGVectorLogo from "@/media/vectordbs/pgvector.png";

import LanceDBOptions from "@/components/VectorDBSelection/LanceDBOptions";
import ChromaDBOptions from "@/components/VectorDBSelection/ChromaDBOptions";
import PineconeDBOptions from "@/components/VectorDBSelection/PineconeDBOptions";
import WeaviateDBOptions from "@/components/VectorDBSelection/WeaviateDBOptions";
import QDrantDBOptions from "@/components/VectorDBSelection/QDrantDBOptions";
import MilvusDBOptions from "@/components/VectorDBSelection/MilvusDBOptions";
import ZillizCloudOptions from "@/components/VectorDBSelection/ZillizCloudOptions";
import AstraDBOptions from "@/components/VectorDBSelection/AstraDBOptions";
import PGVectorOptions from "@/components/VectorDBSelection/PGVectorOptions";

export default function GeneralVectorDatabase() {
  const [saving, setSaving] = useState(false);
  const [hasChanges, setHasChanges] = useState(false);
  const [hasEmbeddings, setHasEmbeddings] = useState(false);
  const [settings, setSettings] = useState({});
  const [loading, setLoading] = useState(true);
  const [searchQuery, setSearchQuery] = useState("");
  const [filteredVDBs, setFilteredVDBs] = useState([]);
  const [selectedVDB, setSelectedVDB] = useState(null);
  const [searchMenuOpen, setSearchMenuOpen] = useState(false);
  const searchInputRef = useRef(null);
  const { isOpen, openModal, closeModal } = useModal();
  const { t } = useTranslation();

  const handleSubmit = async (e) => {
    e.preventDefault();
    if (selectedVDB !== settings?.VectorDB && hasChanges && hasEmbeddings) {
      openModal();
    } else {
      await handleSaveSettings();
    }
  };

  const handleSaveSettings = async () => {
    setSaving(true);
    const form = document.getElementById("vectordb-form");
    const settingsData = {};
    const formData = new FormData(form);
    settingsData.VectorDB = selectedVDB;
    for (var [key, value] of formData.entries()) settingsData[key] = value;

    const { error } = await System.updateSystem(settingsData);
    if (error) {
      showToast(`Failed to save vector database settings: ${error}`, "error");
      setHasChanges(true);
    } else {
      showToast("Vector database preferences saved successfully.", "success");
      setHasChanges(false);
    }
    setSaving(false);
    closeModal();
  };

  const updateVectorChoice = (selection) => {
    setSearchQuery("");
    setSelectedVDB(selection);
    setSearchMenuOpen(false);
    setHasChanges(true);
  };

  const handleXButton = () => {
    if (searchQuery.length > 0) {
      setSearchQuery("");
      if (searchInputRef.current) searchInputRef.current.value = "";
    } else {
      setSearchMenuOpen(!searchMenuOpen);
    }
  };

  useEffect(() => {
    async function fetchKeys() {
      const _settings = await System.keys();
      setSettings(_settings);
      setSelectedVDB(_settings?.VectorDB || "lancedb");
      setHasEmbeddings(_settings?.HasExistingEmbeddings || false);
      setLoading(false);
    }
    fetchKeys();
  }, []);

  useEffect(() => {
    const filtered = VECTOR_DBS.filter((vdb) =>
      vdb.name.toLowerCase().includes(searchQuery.toLowerCase())
    );
    setFilteredVDBs(filtered);
  }, [searchQuery, selectedVDB]);

  const VECTOR_DBS = [
    {
      name: "LanceDB",
      value: "lancedb",
      logo: LanceDbLogo,
      options: <LanceDBOptions />,
      description:
        "100% local vector DB that runs on the same instance as AnythingLLM.",
    },
    {
      name: "PGVector",
      value: "pgvector",
      logo: PGVectorLogo,
      options: <PGVectorOptions settings={settings} />,
      description: "Vector search powered by PostgreSQL.",
    },
    {
      name: "Chroma",
      value: "chroma",
      logo: ChromaLogo,
      options: <ChromaDBOptions settings={settings} />,
      description:
        "Open source vector database you can host yourself or on the cloud.",
    },
    {
      name: "Pinecone",
      value: "pinecone",
      logo: PineconeLogo,
      options: <PineconeDBOptions settings={settings} />,
      description: "100% cloud-based vector database for enterprise use cases.",
    },
    {
      name: "Zilliz Cloud",
      value: "zilliz",
      logo: ZillizLogo,
      options: <ZillizCloudOptions settings={settings} />,
      description:
        "Cloud hosted vector database built for enterprise with SOC 2 compliance.",
    },
    {
      name: "QDrant",
      value: "qdrant",
      logo: QDrantLogo,
      options: <QDrantDBOptions settings={settings} />,
      description: "Open source local and distributed cloud vector database.",
    },
    {
      name: "Weaviate",
      value: "weaviate",
      logo: WeaviateLogo,
      options: <WeaviateDBOptions settings={settings} />,
      description:
        "Open source local and cloud hosted multi-modal vector database.",
    },
    {
      name: "Milvus",
      value: "milvus",
      logo: MilvusLogo,
      options: <MilvusDBOptions settings={settings} />,
      description: "Open-source, highly scalable, and blazing fast.",
    },
    {
      name: "AstraDB",
      value: "astra",
      logo: AstraDBLogo,
      options: <AstraDBOptions settings={settings} />,
      description: "Vector Search for Real-world GenAI.",
    },
  ];

  const selectedVDBObject = VECTOR_DBS.find((vdb) => vdb.value === selectedVDB);

  return (
    <div className="w-screen h-screen overflow-hidden bg-theme-bg-container flex">
      <Sidebar />
      {loading ? (
        <div
          style={{ height: isMobile ? "100%" : "calc(100% - 32px)" }}
          className="relative md:ml-[2px] md:mr-[16px] md:my-[16px] md:rounded-[16px] bg-theme-bg-secondary w-full h-full overflow-y-scroll p-4 md:p-0"
        >
          <div className="w-full h-full flex justify-center items-center">
            <PreLoader />
          </div>
        </div>
      ) : (
        <div
          style={{ height: isMobile ? "100%" : "calc(100% - 32px)" }}
          className="relative md:ml-[2px] md:mr-[16px] md:my-[16px] md:rounded-[16px] bg-theme-bg-secondary w-full h-full overflow-y-scroll p-4 md:p-0"
        >
          <form
            id="vectordb-form"
            onSubmit={handleSubmit}
            className="flex w-full"
          >
            <div className="flex flex-col w-full px-1 md:pl-6 md:pr-[50px] py-16 md:py-6">
              <div className="w-full flex flex-col gap-y-1 pb-6 border-white light:border-theme-sidebar-border border-b-2 border-opacity-10">
                <div className="flex gap-x-4 items-center">
                  <p className="text-lg leading-6 font-bold text-white">
                    {t("vector.title")}
                  </p>
                </div>
                <p className="text-xs leading-[18px] font-base text-white text-opacity-60">
                  {t("vector.description")}
                </p>
              </div>
              <div className="w-full justify-end flex">
                {hasChanges && (
                  <CTAButton
                    onClick={() => handleSubmit()}
                    className="mt-3 mr-0 -mb-14 z-10"
                  >
                    {saving ? t("common.saving") : t("common.save")}
                  </CTAButton>
                )}
              </div>
              <div className="text-base font-bold text-white mt-6 mb-4">
                {t("vector.provider.title")}
              </div>
              <div className="relative">
                {searchMenuOpen && (
                  <div
                    className="fixed top-0 left-0 w-full h-full bg-black bg-opacity-70 backdrop-blur-sm z-10"
                    onClick={() => setSearchMenuOpen(false)}
                  />
                )}
                {searchMenuOpen ? (
                  <div className="absolute top-0 left-0 w-full max-w-[640px] max-h-[310px] min-h-[64px] bg-theme-settings-input-bg rounded-lg flex flex-col justify-between cursor-pointer border-2 border-primary-button z-20">
                    <div className="w-full flex flex-col gap-y-1">
                      <div className="flex items-center sticky top-0 z-10 border-b border-[#9CA3AF] mx-4 bg-theme-settings-input-bg">
                        <MagnifyingGlass
                          size={20}
                          weight="bold"
                          className="absolute left-4 z-30 text-theme-text-primary -ml-4 my-2"
                        />
                        <input
                          type="text"
                          name="vdb-search"
                          autoComplete="off"
                          placeholder="Search all vector database providers"
                          className="border-none -ml-4 my-2 bg-transparent z-20 pl-12 h-[38px] w-full px-4 py-1 text-sm outline-none text-theme-text-primary placeholder:text-theme-text-primary placeholder:font-medium"
                          onChange={(e) => setSearchQuery(e.target.value)}
                          ref={searchInputRef}
                          onKeyDown={(e) => {
                            if (e.key === "Enter") e.preventDefault();
                          }}
                        />
                        <X
                          size={20}
                          weight="bold"
                          className="cursor-pointer text-white hover:text-x-button"
                          onClick={handleXButton}
                        />
                      </div>
                      <div className="flex-1 pl-4 pr-2 flex flex-col gap-y-1 overflow-y-auto white-scrollbar pb-4 max-h-[245px]">
                        {filteredVDBs.map((vdb) => (
                          <VectorDBItem
                            key={vdb.name}
                            name={vdb.name}
                            value={vdb.value}
                            image={vdb.logo}
                            description={vdb.description}
                            checked={selectedVDB === vdb.value}
                            onClick={() => updateVectorChoice(vdb.value)}
                          />
                        ))}
                      </div>
                    </div>
                  </div>
                ) : (
                  <button
                    className="w-full max-w-[640px] h-[64px] bg-theme-settings-input-bg rounded-lg flex items-center p-[14px] justify-between cursor-pointer border-2 border-transparent hover:border-primary-button transition-all duration-300"
                    type="button"
                    onClick={() => setSearchMenuOpen(true)}
                  >
                    <div className="flex gap-x-4 items-center">
                      <img
                        src={selectedVDBObject.logo}
                        alt={`${selectedVDBObject.name} logo`}
                        className="w-10 h-10 rounded-md"
                      />
                      <div className="flex flex-col text-left">
                        <div className="text-sm font-semibold text-white">
                          {selectedVDBObject.name}
                        </div>
                        <div className="mt-1 text-xs text-description">
                          {selectedVDBObject.description}
                        </div>
                      </div>
                    </div>
                    <CaretUpDown
                      size={24}
                      weight="bold"
                      className="text-white"
                    />
                  </button>
                )}
              </div>
              <div
                onChange={() => setHasChanges(true)}
                className="mt-4 flex flex-col gap-y-1"
              >
                {selectedVDB &&
                  VECTOR_DBS.find((vdb) => vdb.value === selectedVDB)?.options}
              </div>
            </div>
          </form>
        </div>
      )}
      <ModalWrapper isOpen={isOpen}>
        <ChangeWarningModal
          warningText="Switching the vector database will reset all previously embedded documents in all workspaces.\n\nConfirming will clear all embeddings from your vector database and remove all documents from your workspaces. Your uploaded documents will not be deleted, they will be available for re-embedding."
          onClose={closeModal}
          onConfirm={handleSaveSettings}
        />
      </ModalWrapper>
    </div>
  );
}
